Battery Module Seal for Air Release During Paste Filling
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Solution Overview
Problem
Existing battery modules for electric vehicles face challenges in reliably and uniformly filling intermediate spaces with fluids of high viscosity, such as heat-conducting pastes, which is essential for efficient cooling and cell longevity.
Innovation Solution
The battery module design incorporates a gas-permeable or air-permeable seal on the carrier plate that allows displaced air to escape during the introduction of a high-viscosity fluid into the intermediate space between the battery cell stack and the main body, ensuring reliable filling and avoiding air pockets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a high-viscosity fluid is introduced into the intermediate space, then reliable and uniform filling is achieved, but air pockets may form due to trapped air
Solution Approach 1:
The seal is designed with gas-permeable or air-permeable properties, allowing air to escape through the seal during fluid filling while preventing the high-viscosity fluid from leaking. This porous/selective permeable structure resolves the contradiction by enabling air evacuation without compromising fluid containment.
Solution Approach 2:
The gas-permeable seal acts as an intermediary element between the sealed intermediate space and the external environment, selectively allowing air to pass through while blocking the high-viscosity fluid. This mediator enables the coexistence of fluid filling and air evacuation functions.
2Reliability
If the seal is made completely tight to prevent fluid leakage, then fluid containment is improved, but air cannot escape during filling
Solution Approach 1:
The seal utilizes gas-permeable or air-permeable material properties to create selective permeability. The seal structure allows air molecules to pass through while maintaining sufficient tightness to contain the high-viscosity fluid, thus resolving the contradiction between fluid containment and air evacuation.
Solution Approach 2:
The seal exhibits different permeability properties for different substances (gas vs. fluid). It is gas-permeable to allow air escape during filling, while simultaneously being fluid-tight to prevent leakage of the high-viscosity cooling fluid. This local quality differentiation resolves the apparent contradiction.
3Manufacturing precision
If the intermediate space is completely filled with fluid, then cooling efficiency is improved, but detection of fill level becomes difficult
Solution Approach 1:
The system provides visual feedback through the gas-permeable seal - air escaping from the seal indicates the filling progress. When air stops escaping, it signals that the intermediate space is completely filled. This feedback mechanism simplifies fill level detection without compromising cooling efficiency.
Solution Approach 2:
The gas-permeable seal may exhibit visual changes or allow visual observation of air bubbles escaping during filling. This provides a simple visual indicator of fill level, making detection easy without requiring complex measurement systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables uniform and reliable filling of the intermediate space with high-viscosity fluids, preventing air pockets and ensuring efficient cell cooling, which contributes to quicker charging and longer service life of the cells.
Implementation Method 1
The seal is of gas-permeable or air-permeable form, so that, during the introduction of a fluid of relatively high viscosity into an intermediate space (for example gap) between the battery cell stack and the inner surface of the main body, displaced air can escape from the main body through the (gas-permeable) seal.
Implementation Method 2
The fluid of relatively high viscosity with which the intermediate space is at least partially filled may be in the form of a (curable) heat-conducting paste.
Data Source
AI summary
A battery module for a partially or fully electrically operated vehicle, having a battery housing, which has a main body with at least one open end, and at least one battery cell stack, which has a carrier plate at least at one end. The battery cell stack has been introduced into the main body such that the carrier plate substantially closes off the open end of the main body. On the carrier plate, there is provided an at least sectionally peripheral seal, which projects from the carrier plate and bears at least sectionally against the inner surface of the main body. The seal is of air-permeable form, so that, during the introduction of a fluid of relatively high viscosity into an intermediate space between the battery cell stack and the inner surface of the main body, displaced air can escape from the main body through the seal.